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What do liquids and gases have in common? States of matter Do not have a fixed shape Ability to flow, particles can move past each other easily
Why doesn’t a rubber duck sink to the bottom of a bath tub? A force pushes the rubber duck to the top of the water.
This force is an upward force that fluids exert on matter. What keeps the ice floating?
The pressure exerted on the right is equal to the pressure exerted on the left. Theses forces cancel out.
Pressure increases as depth increases. Pressure increases Net force is upward (buoyant force)
The buoyant force on an object is an upward force equal to the weight of the fluid that the object displaces.
Change the shape of an object and you can change the density.
A solid brick’s density is 1.9g/cm3. And the density of water is 1.00g/cm3. How could you get the brick to float?
Where have you heard the word “pressure” in conversation? Air pressure Water pressure Tire pressure Blood pressure
When you pump up a bike tire, what is going on inside the tire?
Pressure is calculated by using the equation below. pressure = Force area Pressure unit is pascal (Pa). It is equal to 1N/m 2
When you blow a bubble, you blow air in one direction. So why does the bubble get rounder as you blow, instead on longer? Fluid property : Fluids exert pressure evenly in all directions.
P 1 = P 2 So our equation can now look like this: F 1 = F 2 A 1 A 2
Give an example of a moving fluid. air moving as wind water moving through pipes food coloring moving through water
Fluids move faster through smaller areas than through larger areas
How are honey and lemonade similar? How are they different? Viscosity is a liquid’s resistance to flow. It is the attraction between the particles that make it viscous.
Think of 5 every day items that are viscous. Can you find a way to change their viscosity? Temperature
P 1 V 1 = P 2 V 2 T 1 T 2 The three laws we will look at take a variable out of this equation and hold it constant.
Boyle’s Law P 1 V 1 = P 2 V 2 Temperature stays constant, so we remove it from the combined gas equation. This was the marshmallow experiment.
Boyle’s Law – Pressure increases, volume decreases. They are inversely proportional.
Charles’ Law V 1 = V 2 T 1 T 2 Pressure stays constant Frozen balloon Room temp balloon
Gay-Lussac’s Law P 1 = P 2 T 1 T 2 Directly proportional
Charles’ Law If I have 45L of helium in a balloon at 298K and increase the temperature of the balloon to 328K, what will the new volume of the balloon be?
Charles Law I have 130L of gas in a piston at a temperature of 523K. If I cool the gas until the volume decreases to 85L, what will the temperature of the gas be?
Gay-Lussac’s Law 10.0 L of a gas is found to exert 97.0 kPa at 298K. What would be the required temperature to change the pressure to kPa?
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The fun never stops.... Liquids and Gases can exert forces. – Examples: waves crashing, wind Liquids and Gases can exert forces. – Examples: waves crashing,
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